Blood spatter works the same way that water droplets are spilled. The force and the amount of the blood is the size of the spatter.Low velocity spatters is usually the result of dripping blood, low velocity spatters can also result from pools of blood around the body of the victim. The medium velocity spatter can be caused by a object such as a bat, or intense beating of the fist, or stabbing. High velocity spatters are caused by gunshot wounds, or other weapons with a lot of force. It looks like a spay or fine blood droplets of blood.